6 down
Something
to
mind
in
central
Singapore
(3)
Something to mind in central Singapore (3)
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hints
The definition is at the beginning of the clue.
How the clue works
The Tube announcement tells you to mind the gap, so Something to mind is the definition. For the wordplay, "in central" tells you to look inside "Singapore" for a hidden answer, and there it is sitting right in the middle of the word.